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(hex:7C) is a glitch item in Pokémon Yellow. It is an unterminated name glitch item.

Using this glitch item outside of battle with a 0x50 sub-tile saved in the early screen data will result in the player throwing a Poké Ball with one of Professor Oak's 'good' Pokédex jingles. This Poké Ball rolls 256 times until a glitchy sprite appears, Hyper Beam's animation is played and another Poké Ball is thrown, however the game then freezes.

If an early 0x50 sub-tile is forced on to the screen in battle (e.g. with arbitrary code execution) this glitch item will have the same effect but without the glitch sprite, otherwise will freeze the game due to being an unterminated name glitch item.